Comparison of 122 GHz Lens Antennas for System-on-Chip FMCW Radar With Minimum Back Reflection and High Gain

Bezer A. E., Abbak M., Gursoy T., Aydin U.

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, vol.19, no.12, pp.2329-2333, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 12
  • Publication Date: 2020
  • Doi Number: 10.1109/lawp.2020.3032667
  • Journal Name: IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.2329-2333
  • Keywords: Radar antennas, Lenses, Antenna measurements, Radar cross-sections, Antenna radiation patterns, Back-reflection, lens antennas, millimeter-wave antennas, radar, system-on-chip (SoC), ACCURACY, SENSOR, BEAM, SIZE
  • Middle East Technical University Affiliated: Yes

Abstract

Three different dielectric lens antennas are designed to enhance range of a commercially available 122 GHz radar system-on-chip transceiver with antennas in package. A Fresnel-zoned lens antenna, a plano-hyperbolic lens antenna with one-refracting surface, and a conventional plano-hyperbolic lens antenna with two refracting surfaces are compared. All lens antennas are made of Teflon (PTFE). Problem of back-reflection and its degrading effect on radar performance is addressed. In addition to simulations, an in-house 122 GHz radar system utilizing a system-on-chip transceiver is used to measure radiation pattern, gain, and back-reflection. It is shown that conventional plano-hyperbolic lens antenna with two-refracting surface has higher gain and lower back-reflection than plano-hyperbolic lens antenna with one-refracting surface. However, weak targets near the radar can only be detected by Fresnel-zoned lens antenna which causes no additional back-reflection. If transmit power is increased, Fresnel-zoned lens antenna outperforms conventional plano-hyperbolic lens antenna with two-refracting surfaces.